(iOS) - JSON parsing snippets

JSONSnippets.mm

//Init a class model from a NSDictionary
- (id)initWithDictionary:(NSDictionary*)dictionary {
    
    if(!dictionary || [dictionary isKindOfClass:[NSNull class]]) {
        
        return nil;
    }
    self = [super init];
    if(self) {
        
        // TODO: check if classes can be readily instatiated too.
        NSDictionary *classProps = [RSBaseModel classPropsFor:[self class]];
        if(classProps.allKeys.count == 0) {
            
            NSLog(@"Class %@ has no properties.", [self class]);
            return nil;
        }
        for(NSString *propertyName in [self propertyNames]) {
        
            if([classProps[propertyName] isEqualToString:@"NSDate"]) {
                
                // Initialize the dates based on the received string.
                // Maybe it is not needed, but I have to check it.
                NSString *dateString = dictionary[propertyName];
                NSDate *date;
                if(![dateString isKindOfClass:[NSNull class]]) {
                    
                    date = [dateString toFullDate];
                }
                else {
                    
                    date = nil;
                }
                [self setValue:date forKey:propertyName];
            }
            else {
                
                NSString *strippedPropertyName = [self excludeUnderscorePrefix:propertyName];
                if(strippedPropertyName) {
                
                    id value = dictionary[strippedPropertyName];
                    if(!value) {
                    
                        value = [[NSClassFromString(classProps[propertyName]) alloc] init];
                    }
                    if(![value isKindOfClass:[NSNull class]]) {
                     
                        [self setValue:value forKey:propertyName];
                    }
                }
            }
        }
    }
    return self;
}

- (NSArray*)propertyNames {
    
    unsigned int propertyCount = 0;
    objc_property_t *properties = class_copyPropertyList([self class], &propertyCount);

    NSMutableArray *propertyNames = [NSMutableArray array];
    for (unsigned int i = 0; i < propertyCount; ++i) {
        
        objc_property_t property = properties[i];
        const char * name = property_getName(property);
        [propertyNames addObject:[NSString stringWithUTF8String:name]];
    }
    free(properties);
    return propertyNames;
}

//Convert an array of dictionaries in a NSArray of model classes
-(NSArray*)getModelArrayForClassNamed:(NSString*)className
                         withJSONArray:(NSArray*)jsonArray {
    
    if([jsonArray isKindOfClass:[NSNull class]]) {
        
        return nil;
    }
    NSMutableArray *finalArray = [[NSMutableArray alloc] initWithCapacity:10];
    for(NSDictionary *dict in jsonArray) {

        id item = [[NSClassFromString(className) alloc] initWithDictionary:dict];
        [finalArray addObject:item];
    }
    return (NSArray*)finalArray;
}


-(NSDictionary*) getJsonFromFileWithPath:(NSString*)path {
    
    NSBundle *bundle    = [NSBundle bundleForClass:[self class]];
    NSString *resource  = [bundle pathForResource:path ofType:@"json"];
    NSData *myData      = [NSData dataWithContentsOfFile:resource];
    NSError* error;
    NSDictionary* json = [NSJSONSerialization JSONObjectWithData:myData options:kNilOptions error:&error];
    return json;
}


-(UIColor *)colorWithHexString:(NSString *)stringToConvert
{
    @try {
        NSString *noHashString = [stringToConvert stringByReplacingOccurrencesOfString:@"#" withString:@""]; // remove the #
        NSScanner *scanner = [NSScanner scannerWithString:noHashString];
        [scanner setCharactersToBeSkipped:[NSCharacterSet symbolCharacterSet]]; // remove + and $
        
        unsigned hex;
        if (![scanner scanHexInt:&hex]) return nil;
        int r = (hex >> 16) & 0xFF;
        int g = (hex >> 8) & 0xFF;
        int b = (hex) & 0xFF;
        
        return [UIColor colorWithRed:r / 255.0f green:g / 255.0f blue:b / 255.0f alpha:1.0f];
    }
    @catch (NSException *exception) {
        return nil;
    }
}